Forms 角度4形式验证器-minLength&;maxLength不适用于字段类型编号
我正在尝试开发一个联系人表单,我希望用户输入长度在10-12之间的电话号码值 值得注意的是,同样的验证工作在消息字段上,这是唯一一个给我带来麻烦的数字字段 我有如下代码: HTML:Forms 角度4形式验证器-minLength&;maxLength不适用于字段类型编号,forms,angular,validation,angular4-forms,Forms,Angular,Validation,Angular4 Forms,我正在尝试开发一个联系人表单,我希望用户输入长度在10-12之间的电话号码值 值得注意的是,同样的验证工作在消息字段上,这是唯一一个给我带来麻烦的数字字段 我有如下代码: HTML: <form [formGroup]="myForm" (ngSubmit)="myFormSubmit()"> <input type="number" formControlName="phone" placeholder="Phone Number"> <
<form [formGroup]="myForm" (ngSubmit)="myFormSubmit()">
<input type="number" formControlName="phone" placeholder="Phone Number">
<input type="text" formControlName="message" placeholder="Message">
<button class="button" type="submit" [disabled]="!myForm.valid">Submit</button>
</form>
您不应该在这里使用长度,对于最小值和最大值,请使用这样的自定义验证器
var numberControl = new FormControl("", CustomValidators.number({min: 10000000000, max: 999999999999 }))
更新1:
phone: ['', [Validators.required, Validators.min(10000000000), Validators.max(999999999999)]],
import { AbstractControl, ValidatorFn } from '@angular/forms';
export class customValidationService {
static checkLimit(min: number, max: number): ValidatorFn {
return (c: AbstractControl): { [key: string]: boolean } | null => {
if (c.value && (isNaN(c.value) || c.value < min || c.value > max)) {
return { 'range': true };
}
return null;
};
}
}
像下面这样使用它,效果非常好:
phone: ['', [Validators.required, customValidationService.checkLimit(10000000000,999999999999)]],
客户验证服务:
phone: ['', [Validators.required, Validators.min(10000000000), Validators.max(999999999999)]],
import { AbstractControl, ValidatorFn } from '@angular/forms';
export class customValidationService {
static checkLimit(min: number, max: number): ValidatorFn {
return (c: AbstractControl): { [key: string]: boolean } | null => {
if (c.value && (isNaN(c.value) || c.value < min || c.value > max)) {
return { 'range': true };
}
return null;
};
}
}
从'@angular/forms'导入{AbstractControl,ValidatorFn};
导出类customValidationService{
静态检查限制(最小:编号,最大:编号):验证器fn{
return(c:AbstractControl):{[key:string]:boolean}| null=>{
如果(c.value&(isNaN(c.value)| | c.valuemax)){
返回{'range':true};
}
返回null;
};
}
}
尝试以下工作示例代码:
component.html
<div class="container">
<form [formGroup]="myForm"
(ngFormSubmit)="registerUser(myForm.value)" novalidate>
<div class="form-group" [ngClass]="{'has-error':!myForm.controls['phone'].valid}">
<label for="phone">Email</label>
<input type="phone" formControlName="phone" placeholder="Enter Phone"
class="form-control">
<p class="alert alert-danger" *ngIf="myForm.controls['phone'].hasError('minlength')">
Your phone must be at least 5 characters long.
</p>
<p class="alert alert-danger" *ngIf="myForm.controls['phone'].hasError('maxlength')">
Your phone cannot exceed 10 characters.
</p>
<p class="alert alert-danger" *ngIf="myForm.controls['phone'].hasError('required') && myForm.controls['phone'].dirty">
phone is required
</p>
</div>
<div class="form-group text-center">
<button type="submit" class="btn btn-primary" [disabled]="!myForm.valid">Submit</button>
</div>
</form>
</div>
<form [formGroup]="myForm">
<input type="number" formControlName="myNumberField">
<div *ngIf="this.myForm.controls['myNumberField'].errors && this.myForm.controls['myNumberField'].errors.min">
<span class="error-message">Value must be at least {{myNumberFieldMin}}</span>
</div>
<div *ngIf="this.myForm.controls['myNumberField'].errors && this.myForm.controls['myNumberField'].errors.max">
<span class="error-message">Maximum value is {{myNumberFieldMax}}</span>
</div>
</form>
密码长度必须至少为5个字符。
您的密码不能超过15个字符。
请输入您的密码!
对于数字
字段,可以使用内置角度验证来验证最小值和最大值,如下所示:
.ts
import { FormGroup, FormBuilder, Validators } from '@angular/forms';
export class AppComponent implements OnInit {
myForm: any;
constructor(
private formBuilder: FormBuilder
) {}
ngOnInit() {
this.myForm = this.formBuilder.group({
phone: [null, Validators.compose([Validators.required, Validators.minLength(5), Validators.maxLength(10)])]
});
}
}
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
private myNumberFieldMin: number = 1;
private myNumberFieldMax: number = 1000000;
constructor() {
this.myForm = this.formBuilder.group({
myNumberField
})
this.myForm.controls.myNumberField.setValidators([
Validators.min(this.myNumberFieldMin),
Validators.max(this.myNumberFieldMax)
]);
html
<div class="container">
<form [formGroup]="myForm"
(ngFormSubmit)="registerUser(myForm.value)" novalidate>
<div class="form-group" [ngClass]="{'has-error':!myForm.controls['phone'].valid}">
<label for="phone">Email</label>
<input type="phone" formControlName="phone" placeholder="Enter Phone"
class="form-control">
<p class="alert alert-danger" *ngIf="myForm.controls['phone'].hasError('minlength')">
Your phone must be at least 5 characters long.
</p>
<p class="alert alert-danger" *ngIf="myForm.controls['phone'].hasError('maxlength')">
Your phone cannot exceed 10 characters.
</p>
<p class="alert alert-danger" *ngIf="myForm.controls['phone'].hasError('required') && myForm.controls['phone'].dirty">
phone is required
</p>
</div>
<div class="form-group text-center">
<button type="submit" class="btn btn-primary" [disabled]="!myForm.valid">Submit</button>
</div>
</form>
</div>
<form [formGroup]="myForm">
<input type="number" formControlName="myNumberField">
<div *ngIf="this.myForm.controls['myNumberField'].errors && this.myForm.controls['myNumberField'].errors.min">
<span class="error-message">Value must be at least {{myNumberFieldMin}}</span>
</div>
<div *ngIf="this.myForm.controls['myNumberField'].errors && this.myForm.controls['myNumberField'].errors.max">
<span class="error-message">Maximum value is {{myNumberFieldMax}}</span>
</div>
</form>
值必须至少为{{MyNumberFieldAdmin}}
最大值为{myNumberFieldMax}}
多个参数或多个条件的表单验证应作为单个验证器组成,否则会出现可观察或承诺错误:
phone: ['', Validators.compose([Validators.required,Validators.min(10000000000), Validators.max(999999999999)])],
使用方法,将多个验证器组合到单个函数中
更新.TS文件如下:
this.myForm=this.formBuilder.group({
电话:['',Validators.compose([Validators.required,Validators.minLength(10),Validators.maxLength(12)],
消息:['',Validators.compose([Validators.required,Validators.minLength(10),Validators.maxLength(100)])
});代码>如果您想通过多个验证器验证字段,那么您应该尝试以下方法
phone: ['', Validators.compose([
Validators.required,
Validators.minLength(10),
Validators.maxLength(12)])
])],
我有一个100%有效的技巧
定义“文本”而不是“数字”类型的输入
例如:
然后使用作为验证一部分的模式
比如:
this.ValidOtpForm = this.formbuilder.group({
OtpUserInput: new FormControl(
{ value:'', disabled: false },
[
Validators.required,
**Validators.minLength(6),
Validators.pattern('[0-9]*')**
]),
});
这意味着我们定义了适合最小长度的输入类型文本,并且
为数值定义模式(验证),以便我们可以同时实现这两个目标
验证
剩余代码:
<mat-error *ngIf="RegistrationForm.controls['Password'].hasError('minlength')">Use 6 or more characters with a mix of letters</mat-error>
<mat-error *ngIf="ValidOtpForm.controls['OtpUserInput'].hasError('pattern')">Please enter numeric value.</mat-error>
在字母组合中使用6个或更多字符
请输入数值。
保留
并将int值转换为字符串
const phoneControl: FormControl = this.myForm.controls.phone;
// Do not forget to unsubscribe
phoneControl.valueChanges.subscribe(v => {
// When erasing the input field, cannot read toString() of null, can occur
phoneControl.setValue((v && v.toString()) || null, { emitEvent: false });
});
这个技巧会有帮助
在.html文件中
<input type="text" (keyup)="onKeyUp($event)" formControlName="phone" placeholder="Phone Number">
和其他验证
phone: ['', Validators.compose([
Validators.required,
Validators.pattern('^[0-9]{0,30}$')])
])],
上述模式代码允许数字最多为30位。
如果你想要最少两位数,你可以这样做
Validators.pattern('^[0-9]{2,30}$')
您可以使用模式来验证您的电话号码,并将输入类型更改为文本
<input type="text" formControlName="phone" placeholder="Phone Number">
并更改表单控件上的验证程序
phone: ['', [Validators.required, Validators.pattern(this.phonePattern)]],
您可以显示错误:
<div *ngIf="myForm.get('phone').invalid">
<div class="error-message invalid-feedback" *ngIf="myForm.get('phone').hasError('required')">
required!
</div>
<div class="error-message invalid-feedback" *ngIf="myForm.get('phone').hasError('pattern')">
invalid!
</div>
</div>
必修的!
无效的
就表单验证而言,数字没有长度。如果你想要10-12位数字,你真正想要的是1000000000到10000000000之间的数字,当然?是的,我需要1000000000到9999999999之间的数字,然后使用它,而不是尝试检查长度。所以没有默认方法?我们必须创造一个来限制这些?你为什么这么说?请参阅,其中显示了从“@angular/core”导入的min
和max
.Ts文件{Component,OnInit};从“@angular/forms”导入{FormBuilder、FormControl、FormGroup、ReactiveFormsModule、Validators}@组件({selector:'ftl signup',templateUrl:'./signup.Component.html',styleURL:['./signup.Component.scss']})导出类密码检查器实现OnInit{validateForm:FormGroup;构造函数(私有fb:FormBuilder){password:[''.[Validators.required,Validators.minLength(5),Validators.maxLength(15)]],});}您应该编辑您的答案,而不是在自己的答案中添加注释。我知道我在这里迟到了一年,这与OP中的要求不完全一样,但没有人希望输入电话号码作为
。“更新1”下的答案对于整数是正确的,但电话号码不是整数。甚至不是我一直在寻找的“关于电话号码的谎言”这篇文章,但它有很多优点。非常好的作品对我来说非常完美。一个小细节是,当我们在mat error
中声明minlength
时,请注意它是小写的,在验证器中,它是大写的minLength
。如果Angular可以不使用它,为什么还要使用额外的事件keyup
?我添加了keyup
事件来删除特殊字符或运算符,否则,添加keyup
事件还是不使用type=“number”
删除特殊字符,不是吗?是的,它会删除type=number
中的特殊字符,但在输入时会有+
,-
,e
。如果要在输入usekeyup
事件时限制这些运算符,则一切正常。